| depressor septi muscle | <anatomy> A vertical fasciculus from the orbicularis oris musculus passing upward along the median line of the upper lip, and inserted into the cartilaginous septum of the nose; action, depresses septum; nerve supply, facial. Synonym: musculus depressor septi, depressor muscle of septum. (05 Mar 2000) |
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| depressor supercilii muscle | <anatomy> Fibres of the orbital part of the orbicularis oculi musculus insert in the eyebrow; action, depresses eyebrow; nerve supply, facial. Synonym: musculus depressor supercilii, depressor muscle of eyebrow. (05 Mar 2000) |
| depriment | Serving to depress. "Depriment muscles." Origin: L. Deprimens, p. Pr. Of deprimere. See Depress. Source: Websters Dictionary (01 Mar 1998) |
| deprivation | The loss or absence of parts, organs, powers or things that are needed. Origin: L. De = from, privare = to remove (18 Nov 1997) |
| deprivation amblyopia | A suppression of central vision in one eye due to faulty image formation; for example, by a corneal scar, a cataract, or a droopy eyelid. Synonym: deprivation amblyopia. (05 Mar 2000) |
| depsipeptide | <biochemistry> Polypeptides that contain ester bonds as well as peptides. Naturally occurring depsipeptides are usually cyclic, they are common metabolic products of microorganisms and often have potent antibiotic activity (examples are actinomycin, enniatins, valinomycin). (18 Nov 1997) |
| depth | Distance from the surface downward. (05 Mar 2000) |
| depth compensation | In ultrasonography, an increase in receiver gain with time to compensate for loss in echo amplitude with depth, usually due to attenuation. Synonym: attenuation compensation, depth compensation, time compensation gain, time-compensated gain, time-varied gain control, time-varied gain. (05 Mar 2000) |
| depth dose | The dose of radiation at a distance beneath the surface, including secondary radiation or scatter, in proportion to the dose at the surface. (05 Mar 2000) |
| depth of field | <microscopy> The depth or thickness of the object space that is simultaneously in acceptable focus. The distance between the closest and farthest objects in focus within a scene as viewed by a lens at a particular focus and with given settings. The depth of field varies with the focal length of the lens and its f-stop setting or numerical aperture, and the wavelength of light. Depth of fields only a small fraction of a micrometre can be achieved at 546 nm with microscope lenses of N.A. Greater than 0.9. (05 Aug 1998) |
| depth of focus | <microscopy> The depth or thickness of the image space that is simultaneously in acceptable focus. The range of distances between a lens and image plane (target in the video pickup device) for which the image formed by the lens at a given setting is clearly focused. With a high-numerical aperture microscope objective, the depth of field is very shallow, but the depth of focus can be quite deep and reach several millimetres. (05 Aug 1998) |
| depth perception | Perception of three-dimensionality. (12 Dec 1998) |
| depth psychology | The psychology of the unconscious, especially in contrast with older (19th century) academic psychology dealing only with conscious mentation; sometimes used synonymously with psychoanalysis. (05 Mar 2000) |
| depth recording | Study of subcortical cerebral electrical activity after placing electrodes in these areas. (05 Mar 2000) |
| depthless | 1. Having no depth; shallow. 2. Of measureless depth; unfathomable. "In clouds of depthless night." (Francis) Source: Websters Dictionary (01 Mar 1998) |